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Subject :IMO    Class : Class 5

The odometer of a bike showed 24,572 km in May. After being used for three months it showed 38139 km in July. If it had done 7578 km in May and June, then how much did it do in the month of July?

A 7395 km
B 5989 km
C 8674 km
D 6376 km

very tricky question

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